FK4 is based on the premise that the series finale, "Last Knight", never took place; and therefore continues the Forever Knight storyline using essentially the same regular cast as Season Three. There is somewhat greater continuity between the episodes than in the actual series; however, aside from the two-part season premiere, each episode is essentially self-contained, as in canon.

At the time Forever Knight was on the air, Greer was not part of organized FK fandom, nor online. As with a number of other fan writers, the impetus to write Forever Knight fiction came from her dissatisfaction with the series finale; and her first script was an alternative ending. She then went on to write several additional stories, initially also as full scripts, before devising a more satisfactory format for "transcribing" episodes that would never be filmed. Eventually, the number of episodes she had written inspired her to develop them into a full virtual season.

FK4 was written between 1996 and 2004. In all, twenty-two episodes written in a modified script format comprise the full fourth season. Each episode includes notes and TV Guide-style blurbs, as well as other ancillary material.

After going on line and discovering Forever Knight fandom, Greer gave her Season Four the name "FK4" to distinguish it from another virtual Season Four for the series, generally known as V4S. FK4 made its debut on 20 October 2004, running until 8 May 2005. Each episode was announced Sunday night on FORKNI-L@LISTS.PSU.EDU, and then linked in to the episode guide on her website so that readers could access it. New episodes appeared more or less weekly, with a hiatus in the fall for War 12, another for Christmas, and sufficient skip weeks to simulate the schedule of an actual television season.

Because for a number of years, FK4 and its ancillary pages comprised the whole of Greer's website, the website itself is also usually referred to "FK4", although today it includes her other fan fiction as well.

Format

Greer was, however, finding frustrating the attempt to visualize action on the sets employed in filming the series. Some portions of the sets had rarely been in shot; and the action of the camera distorted the layout of the various areas within a set. For this reason, during the spring and summer of 1997, she took the time to run through her tapes of the series in order to piece together what the actual sets must have looked like.

With this additional detail, it became possible to visualize more accurately the exact movement of the actors through the sets and the camera angles that would be employed—or would have been employed had the stories she had written not been fan fiction. She wished to add this additional detail to her stories in order to aid in visualizing what would be seen if it had been filmed, so that the reader would be able to watch the story mentally, as if it were on a television screen. This degree of detail is not included in professional scripts, which are antecedent to the actual directing and filming of a television series. Including it therefore resulted in a significant modification of the canonical full script format, not least in length. Scripts in the modified format are typically 115 to 120 pages in length.

FK418: Blood ThirstA case that Nick worked with his first partner is reopened when new evidence links it with a series of similar killings outside Toronto. Guest-starring John Kapelos as Det. Don Schanke. Rated: PG

FK420: Confession is Good for the SoulConclusion. A priest refuses to break the seal of the confessional even to catch a serial killer. Guest-starring Michael McManus (Lexx) as Father Rochefort. Rated: PG

FK421: Cover StoryWhile Natalie is at a conference, the body of a vampire victim is autopsied by another pathologist. Rated: PG